"Vertical" horizontal branches and the age of the dwarf spheroidal galaxy Leo I.

Details "Vertical" horizontal branches and the age of the dwarf spheroidal galaxy Leo I. "Vertical" horizontal branches and the age of the dwarf spheroidal galaxy Leo I.

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...304..365c&link_type=abstract

Astronomy and Astrophysics, v.304, p.365

Astronomy and Astrophysics

Astrophysics

19

Stars: Evolution, Stars: Horizontal Branch, Galaxies: Individual: Leo I, Galaxies: Evolution, Galaxies: Stellar Content

Scientific paper

We show that the observed spread in magnitude of He-burning stars clumping along the red giant branch in not-too-old metal poor stellar clusters can be used to get an upper limit for the cluster age. As a result we find that the dwarf spheroidal galaxy Leo I appears even younger than previously suggested, with an age lower or of the order of 2.0Gyr. Firmer conclusions will be reached when detecting the cluster main sequence turn-off which is expected in the range of V=24-24.3mag, depending on the actual cluster age.

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